Synthesis and photoluminescence properties of rare earth doped BaAl2S4 and MgAl2S4 phosphor

Abstract

Different synthesis techniques for BaAl2S4 have been described in literature. Conventionally thioaluminates (BaAl2S4) were prepared by solid state reaction. BaAl2S4 was prepared by using BaS and Al2S3 in H2S atmosphere [1, 2]. Sulfurization reduction of multi component oxide precursor was used to prepare BaAl2S4 in CS2 atmosphere at 1050°C. [2, 3]. Oh et al. [4] prepared MgAl2S4 doped with Co2+ by the chemical transport reaction method. All these methods require proper apparatus and they are difficult to handle.The synthesis method and photoluminescence properties of MgAl2S4:Eu2+ and BaAl2S4:Ce3+ phosphors are reported. In this paper wet chemical co-precipitation method is described for synthesis of magnesium and barium aluminates. BaAl2S4 and MgAl2S4 phosphors doped with Eu2+ and Ce3+ shows strong excitation in nUV region. This method is very simple and does not require H2S gas flow [2]. We successfully prepared MgAl2S4:Eu2+ and BaAl2S4:Ce3+ powders by this method. MgAl2S4 doped with Eu2+ act as blue component in display application.